Greater Wellington
Roof Treatment & Moss Removal Wellington
Wellington roofs collect moss, lichen and mould faster than most regions thanks to persistent moisture, wind-driven rain and coastal salt. Green streaks on north-facing slopes and dark discolouration in roof valleys are signs organic growth is holding moisture against your tiles or iron.
Our services
Absolute House Wash has served Wellington and Greater Wellington since 2018. Every job uses low-pressure soft washing, safe for weatherboard, stucco, brick and fibre cement, with transparent instant pricing and no hidden call-out fees. Book online in minutes or request an estimate for larger properties.
Our biocide roof treatment is spray-and-leave — not pressure washing. High-pressure blasting strips protective coatings on Colorsteel and concrete tile, and can void manufacturer warranties. We apply a slow-acting, non-chlorine algae-stat that kills moss, mould and lichen at the root over 3–6 months, with full results continuing for up to a year.
We treat concrete tile, long-run iron, Colorsteel and decramastic roofs across Wellington City, Lower Hutt, Porirua and the Kapiti Coast. Reapplication every 18–24 months keeps organic material from regrowing. Pair roof treatment with gutter clearing in one visit — popular across coastal suburbs like Seatoun and Titahi Bay, and the leafy northern hills in Ngaio, Newlands and Johnsonville.
Read our guide: When to treat your roof in Wellington →
Get an instant estimate for your Wellington property with the same pricing as our main site, with optional 5% discount when you pay in full upfront.
“Roof treatment worked wonders. Moss gone and hasn't come back. Highly recommend for Tawa residents.”
Roof treatment results
Biocide spray-and-leave — moss and lichen die back over months without pressure washing damage.
Frequently asked questions
Common questions about roof treatment & moss removal wellington.
Most Wellington roofs start from around $190 for smaller homes up to ~120 m², with larger roofs from ~$260. Properties over 200 m² are priced per square metre. Get an exact figure in under two minutes with our free instant online estimate — no call-out fee.
No. We apply a biocide spray-and-leave treatment that kills moss, lichen and mould at the root over several months. This extends roof life without the coating damage caused by pressure washing concrete or metal tiles.
We treat concrete tile, long-run iron, Colorsteel and decramastic roofs across Greater Wellington. The biocide is safe on factory coatings and won't void Colorsteel warranties the way high-pressure washing can.
The treatment is slow-acting — you'll typically notice moss and lichen dying back within 3–6 months as rain washes away dead organic matter. Full results continue to improve over 12 months.
We recommend reapplication every 18–24 months to prevent regrowth. Wellington's moisture and coastal air mean roofs collect organic growth faster than drier regions.
Yes — this is a popular combination. Clearing gutters first ensures treated runoff drains properly, and booking both together saves a separate visit.
Nearby service areas
Popular suburbs we serve across Wellington and the Hutt Valley.
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Same services and pricing logic as our online estimate calculator: house wash, roof, gutters, spider treatment & more. Pay in full upfront for 5% off.